Development of Microstructures in Backlight Unit for Optical Enhancement

• Main Authors: Yen-Chang Hsieh, 謝延昌
• Other Authors: Shih-Ming Yang
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/54142647527155548639

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 94 === Researches of the design of light guide plate (LGP) have often suggested that the microstructures would likely affect the optical performance of LGP, but their relation remains unknown as of today. This thesis attempts to explore the relation, so as to improve the optical performance of a display device in power efficiency and luminance uniformity. Current design practices of try-and-error and relying on expert-only can be significantly improved. Results of this study show that the groove-shaped microstructures on the top surface of a wedge-shaped LGP apparently achieve better power efficiency, and the groove-shaped microstructures on the LED side of LGP and the spherical patterns on the bottom surface of the LGP also obtain better luminance uniformity and power efficiency. Combination of three designs is proposed in this thesis. The first model is provided with 81% luminance uniformity, 73% power efficiency and 2049.67cd/m2 center luminance, due to the high quality of luminance uniformity. This LGP can be used for the backlight unit that requires high-level uniformity. The second model applied to general backlight unit provides with 88.76% luminance uniformity, 75% power efficiency and 2105.8cd/m2 center luminance. The third model provides with 90.1% luminance uniformity, 81% power efficiency and 2274.29cd/m2 center luminance. This thesis improves the previous studies’ findings by providing a much more detailed examination of design processes. The three models with simple design of microstructures can improve the power efficiency and luminance uniformity.